EFDA-JET-CP(07)03/43

Electron Heated Hybrid JET Discharges: Experimental Results and Modelling

Tokamak discharges in the hybrid scenario, with a wide area of low magnetic shear (s) and central safety factor (q) close to one, have shown improved MHD stability at high. Realization of hybrid scenarios with predominant electron heating is a significant step towards ITER-relevant conditions. Such hybrid regimes, with Te > Ti, were first obtained in 2004 in JET; however, they were poorly diagnosed. Recently, these experiments were repeated and extended, with all diagnostics available. After a review of the experiments, this paper presents modeling results, and a comparison with the standard (ion heated) hybrid scenario.
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